CN1690458A - Liquid bearing type swiveling mechanism, creosoting process and recording medium control device - Google Patents
Liquid bearing type swiveling mechanism, creosoting process and recording medium control device Download PDFInfo
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- CN1690458A CN1690458A CN 200510066841 CN200510066841A CN1690458A CN 1690458 A CN1690458 A CN 1690458A CN 200510066841 CN200510066841 CN 200510066841 CN 200510066841 A CN200510066841 A CN 200510066841A CN 1690458 A CN1690458 A CN 1690458A
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Abstract
This fluid bearing type rotating device has a bearing unit, which has a sleeve having a bearing hole provided in a nearly central part thereof, a shaft rotatably inserted into the bearing hole in relation to the sleeve, and a bearing surface having at least one or more pairs of patterned dynamic pressure generating grooves formed of a plurality of shallow grooves in any one of the peripheral surface of the shaft and the inner peripheral surface of the sleeve and in which the lubricant is filled in a space between the shaft and the sleeve. In the bearing unit, the sleeve or a space between the sleeve and a cover plate for nearly covering an end surface of the sleeve is provided with a tapered space, of which axial width is narrow in a connection part to the bearing hole and enlarged as coming close to the periphery of the sleeve, and the peripheral part of the tapered space is provided with a ventilation hole allowing outside air to flow. So this invention can provide a reliable fluid bearing rotating device capable of preventing leakage of a lubricant due to a fall shock and air accumulated inside a bearing.
Description
Technical field
The present invention relates to the correction oil injection method and the recording medium control device of Hydrodynamic bearing type rotary device, lubricant body.
Background technique
In recent years, the storage capacity of CD etc. increases sharp, for realize at a high speed data transfer rate corresponding with it, also requires highi degree of accuracy and is rotated at high speed for the disc whirligig of recording device.For the rotary main shaft portion of these disc whirligigs, general use can make the bearing attenuate, be suitable for the Hydrodynamic bearing type rotary device of high speed rotating.
Hydrodynamic bearing type rotary device accompanies the oil as oiling agent between axle and sleeve, utilize dynamic pressure occurrence groove generating pump to inhale pressure when rotated.Thus, axle can be rotated driving with the relative sleeve of non-contact mode.Hydrodynamic bearing type rotary device is owing to be the non-way of contact, so be suitable for that surface friction drag is minimum, the high speed rotating of high-durability.
In Japanese patent laid-open 6-269142 communique, disclosed the Hydrodynamic bearing type rotary device of example in the past.Use Figure 19 that routine in the past Hydrodynamic bearing type rotary device is described.Figure 19 represents the sectional view of the schematic configuration of the revolving Hydrodynamic bearing type rotary device of axle of example in the past.In Figure 19, Hydrodynamic bearing type rotary device has axle 1, sleeve 2, thrust plate 4, cover plate 5, pedestal 6, motor stator 7, rotor magnet 8, liner 10, clip 11, rotor hub 12.
Between axle 1 and sleeve 2, accompany oiling agent 13.
In the Hydrodynamic bearing type rotary device in the past of structure as mentioned above, its action is described.
Rotate magnetic field when to motor stator 7 energisings, rotor magnet 8 is subjected to rotating force, begins rotation with rotor hub 12, axle 1, clip 11, liner 10, disc 9.By rotation oiling agent 13 is accumulated among dynamic pressure occurrence groove 1A～1D, between axle 1 and the sleeve 2, and axle 1 and thrust plate 4 between generating pump suction pressure.Thus, axle 1 relative sleeve 2 ground float upward, are rotated in the non-contact mode, utilize not shown magnetic head or optical head, carry out the record regenerating of the data on the disc 9.
In oiling agent 13 accumulated inside the occasion of air, bubble 14 utilizes circulation port 2B to move below cover plate 5 and between the upper-end surface of sleeve 2.Because cover plate 5 is ring-types roughly, thus bubble 14 below cover plate 5 from circulation port 2B side direction air-vent 5B side around circumferentially mobile, 5B discharges from air-vent.Thus, bubble 14 does not accumulate among dynamic pressure occurrence groove 1A～1D.Its result can not produce oil film breakage in dynamic pressure occurrence groove 1A～1D, can prevent that the verticity of locking apparatus reduces.
Yet, Li Hydrodynamic bearing type rotary device in the past, as shown in figure 20, on the direction shown in the arrow G 1, apply the occasion of big drop impact load, be arranged in by the upper-end surface of sleeve 2 and the oil that constitutes below of cover plate 5 and accumulate the oiling agent 13 of portion 31, end or air-vent 5B by bearing hole 2A exist the possibility that spills as oiling agent 13 '.
Again, the bubble 14 of bearing inside by circulation port 2B when discharge the outside, the lubricant oil 13 that has a part is released by bubble 14 and the problem that flows out.
Summary of the invention
The present invention, make in view of the above-mentioned problems, to prevent that the impact that causes such as mobile because of the air that falls and accumulate in bearing inside of Hydrodynamic bearing type rotary device from making situation that oiling agent spills as purpose, the high Hydrodynamic bearing type rotary device of reliability is provided and has its recording medium control device.
The present invention also aims to, be provided at the residual hardly correction oil injection method that has air ground that oiling agent is injected to Hydrodynamic bearing type rotary device of the present invention in bearing inside.
In order to address the above problem, the present invention has following structure.
The Hydrodynamic bearing type rotary device of the 1st technological scheme of the present invention, have in substantial middle and be provided with the sleeve of bearing hole and relatively rotate the axle that is inserted in freely in the described bearing hole with described sleeve, either party at least at the inner peripheral surface of the outer circumferential face of described axle and described sleeve, has the bearing surface that constitutes the dynamic pressure occurrence groove more than at least 1 group of pattern-like by a plurality of shallow slots, have in the gap between described axle and described sleeve and be full of the oiling agent bearing unit, in described bearing unit, on the described sleeve or at described sleeve and roughly cover between the cover plate of end face of this sleeve and be provided with cone shape space, with the joint place of described bearing hole, axial narrow width, periphery the closer to described sleeve, axial width is wide more, peripheral part in described cone shape space is provided with the air-vent that air is come in and gone out from the outside.
Even the present invention is because of the mobile etc. of the air that falls and accumulate in bearing inside of Hydrodynamic bearing type rotary device causes the occasion that oiling agent is applied impact, because oiling agent is attracted in the cone shape space, so can not leak from bearing.In the many occasions of the amounts of lubrication that flows into to cone shape space, oiling agent enter to cone shape space peripheral part in.Because cone shape space is the closer to periphery, it is wide more that axial width becomes, and enlarges so accommodate the volume of oiling agent in the space, and oiling agent can not overflow from air-vent.When impact was calmed down, oiling agent utilized capillary force to be attracted to the narrow side (direction of bearing hole) of section in cone shape space, returns to original bearing hole.Therefore, the oiling agent of a part remains in the cone shape space, does not worry that the oiling agent of bearing hole can reduce gradually.
The present invention has the effect that the impact that causes such as mobile that can realize preventing because of the air that falls and accumulate in bearing inside of Hydrodynamic bearing type rotary device makes Hydrodynamic bearing type rotary device situation, that reliability is high that oiling agent spills.
In above-mentioned Hydrodynamic bearing type rotary device, bearing hole comprises the flange accommodation section of example.
In the past, when Hydrodynamic bearing type rotary device injects oiling agent,, after the oiling end of job, drew unnecessary oiling agent in the end of bearing hole (opening portion) in case inject the oiling agent of volume.But in the method, it is difficult wanting the amount that remains in the oiling agent in the bearing is controlled accurately.Adopt the present invention,, draw unnecessary oiling agent from air-vent, so that the surface of oiling agent is positioned at cone shape space assigned position when Hydrodynamic bearing type rotary device injects oiling agent.Thus, can inject the oiling agent of appropriate amount accurately to bearing.
Preferably, cone shape space is arranged near the opening portion of bearing hole.
Again, in the Hydrodynamic bearing type rotary device of the present invention's the 2nd technological scheme, on the basis of the Hydrodynamic bearing type rotary device of the invention described above the 1st technological scheme, one end of described axle is outstanding from described bearing hole, described bearing unit, the cover plate that comprises at least a portion with the end face that makes described outstanding opening portion that passes through and cover described sleeve, between described sleeve and described cover plate, be provided with cone shape space, with the joint place of described bearing hole, axial narrow width, the closer to the periphery of described sleeve, axial width is wide more.
By between sleeve and described cover plate, cone shape space being set, cone shape space can be arranged on low cost near the opening portion of bearing hole.By cone shape space is set near the opening portion of bearing hole, the oiling agent that will overflow because of impact is successfully guided to cone shape space, and its result just can not overflowed.Cone shape space can be located on the sleeve, perhaps also can be arranged on the cover plate to replace it.
Again, the Hydrodynamic bearing type rotary device of the present invention's the 3rd technological scheme, on the basis of the Hydrodynamic bearing type rotary device of the invention described above the 1st or the 2nd technological scheme, one end of described axle is outstanding from described bearing hole, the other end has square with the axis thrust bearing surface, this thrust bearing surface is relative with thrust plate on being fixed on described sleeve, be full of oiling agent in the gap betwixt, described cone shape space, near the end of the described bearing surface of the protuberance side of described axle, be communicated with described bearing hole.
Occasion on the other end that thrust-bearing is arranged on axle, the opening portion of bearing hole exists only in a side of bearing hole.In such structure, when Hydrodynamic bearing type rotary device injects oiling agent, the easy residual air in inside might spill oiling agent because of the moving of air of inside.The present invention can realize preventing Hydrodynamic bearing type rotary device situation, that reliability is high that impact that the mobile grade because of the air that accumulates in bearing inside causes spills oiling agent.
Again, the Hydrodynamic bearing type rotary device of the present invention's the 4th technological scheme, on each the basis of Hydrodynamic bearing type rotary device of the invention described above the 1st～the 3rd technological scheme, described cone shape space is configured to ring-type around described axle.
Adopt the present invention,, also the oiling agent that overflows successfully can be guided to cone shape space even the oiling agent that is impacted moves to any direction.
Again, the Hydrodynamic bearing type rotary device of the present invention's the 5th technological scheme, on each the basis of Hydrodynamic bearing type rotary device of the invention described above the 1st～the 3rd technological scheme, on near the described cover plate the described scavenge port, be provided with the recess of the axial width broadening that makes described cone shape space.
Make the recess of the axial width broadening in cone shape space by setting, the air of sneaking in oiling agent is successfully emitted to the outside from air-vent.In addition, the oiling agent that can will want overflows is housed in the inside of recess.Adopt the present invention, can prevent that oiling agent from overflowing from bearing.When oiling, utilize the roomy space of recess can easily draw the unnecessary oil that remains in cone shape interior volume again.Adopt the present invention, can improve the operation of drawing unnecessary oil.
Again, the Hydrodynamic bearing type rotary device of the present invention's the 6th technological scheme, on each the basis of Hydrodynamic bearing type rotary device of the invention described above the 1st～the 3rd technological scheme, to position, have also that an end is communicated with described bearing hole and intercommunicating pore that the other end is communicated with the peripheral part in described cone shape space at the position that is communicated with described bearing hole from described cone shape space near the other end of described axle.
Remain in the air of the inside of bearing, can emit, maybe can emit to the outside to the outside along bearing hole by intercommunicating pore.
Be provided with on the other end of axle in the Hydrodynamic bearing type rotary device of thrust-bearing, it is difficult that near the air of periphery that remains in thrust-bearing is emitted to the outside along bearing hole.The present invention is provided with in the Hydrodynamic bearing type rotary device of thrust-bearing at the other end of axle, is provided with the intercommunicating pore that near the bearing hole the peripheral part that makes thrust-bearing is communicated with the peripheral part in cone shape space.Thus, near the air of peripheral part that remains in thrust-bearing is emitted to the outside along intercommunicating pore.
Again, the Hydrodynamic bearing type rotary device of the present invention's the 7th technological scheme, on each the basis of Hydrodynamic bearing type rotary device of the invention described above the 1st～the 3rd technological scheme, the distance between the outer circumferential face of described axle and the inner peripheral surface of described cover plate be approximately equal to the joint of described bearing hole on the axial width in described coniform space.
Result of experiment owing to make this structure, so will because of the mobile oiling agent of impact successfully when the guiding of cone shape space and impact are calmed down, can make oiling agent successfully be back to bearing hole from cone shape space.
Again, the Hydrodynamic bearing type rotary device of the present invention's the 8th technological scheme, on the basis of the Hydrodynamic bearing type rotary device of the invention described above the 5th technological scheme, described concave depth be 0.05mm above, below the 1.0mm.
Result of experiment, owing to make this structure, so can prevent that oiling agent from overflowing from bearing.Again, when oiling, remain in the unnecessary oil of recess, so can improve the operation of drawing unnecessary oily operation owing to draw.
Again, the Hydrodynamic bearing type rotary device of the present invention's the 9th technological scheme, on the basis of the Hydrodynamic bearing type rotary device of the invention described above the 1st technological scheme, the diameter of described air-vent be 0.10mm above, below the 1.0mm.
Result of experiment, owing to make this structure, so the occasion of being impacted at Hydrodynamic bearing type rotary device, oiling agent can not overflow from air-vent, when oiling, can easily draw the operation of unnecessary oil by air-vent.
Again, adopt a kind of recording medium control device of the present invention, have each Hydrodynamic bearing type rotary device of the invention described above the 1st～3 technological scheme, the recording medium of belt shape or disc shaped is write down and/or regenerates.
The present invention can realize having the recording medium control device that the impact that causes such as mobile that prevents because of the air that falls and accumulate in bearing inside of Hydrodynamic bearing type rotary device makes Hydrodynamic bearing type rotary device situation, that reliability is high that oiling agent spills.Recording medium is arbitrarily.For example be optical recording media, magneto-optic recording medium, magnetic recording medium etc.Recording medium both can be demountable medium such as DVD disc, also can be the medium that hard disk unit can not unload like that.The use position of Hydrodynamic bearing type rotary device is arbitrarily.For example, the rotating driving device etc. of magnetic drum of rotating magnetic head that can be used in the spool rotating driving device of rotating driving device, the belt shape recording medium of disc, the capstan axle rotating driving device that belt is driven, the lift-launch on spiral sweep type record (or regeneration) device.
Again, the correction oil injection method that the present invention is the 1st kind is the correction oil injection method that each Hydrodynamic bearing type rotary device of the invention described above the 1st～3 technological scheme is injected oiling agent, has: utilize the temporary sealing device described air-vent to be carried out the step of temporary sealing; Near the step of the injection oiling agent gap of described axle and described sleeve; To the step that reduces pressure around the described Hydrodynamic bearing type rotary device; Make the air pressure on every side of described Hydrodynamic bearing type rotary device be back to original step; Remove the step of the described temporary sealing device of described air-vent; The step of near the oiling agent the described air-vent being carried out oil suction from described air-vent insertion Oil sucking device.
The present invention can be implemented in bearing inside residual air ground correction oil injection method that oiling agent is injected to above-mentioned Hydrodynamic bearing type rotary device hardly.In the step of decompression, for example be decompressed to 0.1 barometric pressure degree.
Again, the correction oil injection method that the present invention is the 2nd kind, be the correction oil injection method that each Hydrodynamic bearing type rotary device of the invention described above the 1st～3 technological scheme is injected oiling agent, have: near near the step of the injection oiling agent gap of described axle and described sleeve and described air-vent; To the step that reduces pressure around the described Hydrodynamic bearing type rotary device; Make the air pressure on every side of described Hydrodynamic bearing type rotary device be back to original step; The step of near the oiling agent the described air-vent being carried out oil suction from described air-vent insertion Oil sucking device.
The present invention can be implemented in bearing inside residual air ground correction oil injection method that oiling agent is injected to Hydrodynamic bearing type rotary device of the present invention hardly.
The present invention even accumulated the occasion of air in the oiling agent of bearing inside, also can not can make oiling agent only air be discharged with leaking.Again, even applying the occasion of impact load, oiling agent can not flow out yet.In addition, can be easily and correctly the oil filling amount of the oiling agent of bearing unit is controlled.Therefore, adopt the present invention, can obtain to realize the Hydrodynamic bearing type rotary device that low cost and reliability are high and have the good result of its recording medium control device.
Adopt the present invention, can obtain to be implemented in bearing inside hardly residual air ground with the good result of oiling agent to the correction oil injection method of above-mentioned Hydrodynamic bearing type rotary device injection of the present invention.
New feature of the present invention has been documented in the appended claim especially, but the present invention, for the both sides of structure and content, can be on other purpose and characteristics, conjunction with figs. is understood again basis, from following detailed description, understand better and estimate.
Description of drawings
Fig. 1 is the sectional view of schematic configuration of the Hydrodynamic bearing type rotary device of expression the invention process form 1.
Fig. 2 A is the figure of an example that sees the cover plate 5 of the invention process form 1 from the upper-end surface side of sleeve 2.
Fig. 2 B is the stereogram of an example of the cover plate 5 of the invention process form 1.
Fig. 3 A is the figure of another example that sees the cover plate 5 of the invention process form 1 from the upper-end surface side of sleeve 2.
Fig. 3 B is another routine stereogram of the cover plate 5 of the invention process form 1.
Fig. 4 is the figure of the gap S1～S5 of expression the invention process form 1.
Fig. 5 is the figure that the capillary force on the S1～S5 of the gap of the invention process form 1 is described.
The figure of the Hydrodynamic bearing type rotary device when Fig. 6 is the beginning of oiling operation of expression the invention process form 1.
Fig. 7 is the step S1101 of oiling operation of expression the invention process form 1 and the figure of the Hydrodynamic bearing type rotary device among the S1102.
Fig. 8 is the step S1103 of oiling operation of expression the invention process form 1 and the figure of the Hydrodynamic bearing type rotary device among the S1104.
Fig. 9 is the step S1105 of oiling operation of expression the invention process form 1 and the figure of the Hydrodynamic bearing type rotary device among the S1106.
Figure 10 is the figure of the Hydrodynamic bearing type rotary device among the step S1107 of oiling operation of expression the invention process form 1.
Figure 11 is the flow chart that the oiling operation to the invention process form 1 describes.
Figure 12 is the sectional view of schematic configuration of the Hydrodynamic bearing type rotary device of expression the invention process form 2.
Figure 13 is the sectional view of schematic configuration of the Hydrodynamic bearing type rotary device of expression the invention process form 3.
Figure 14 A is the figure that sees the cover plate 5 ' of the invention process form 3 from the upper-end surface side of sleeve 2 sides.
Figure 14 B is the stereogram of the cover plate 5 ' of the invention process form 3.
Figure 15 is the sectional view of schematic configuration of the Hydrodynamic bearing type rotary device of expression the invention process form 4.
Figure 16 is the sectional view that the correction oil injection method of the invention process form 5 Hydrodynamic bearing type rotary devices injection lubricant oil is described usefulness.
Figure 17 A is the amplification view of an example of cover plate 5 of the Hydrodynamic bearing type rotary device of expression the invention process form 5.
Figure 17 B is another routine amplification view of cover plate 5 of the Hydrodynamic bearing type rotary device of expression the invention process form 5.
Figure 18 is the flow chart that the oiling operation to the invention process form 5 describes.
Figure 19 represents the figure of the schematic configuration of the Hydrodynamic bearing type rotary device of example in the past.
Figure 20 represents the figure of the schematic configuration of another Hydrodynamic bearing type rotary device of example in the past.
Part or all of accompanying drawing is by being described with the summary sex expression that is illustrated as purpose, may not verily describe the relativity size and location of the reality of the key element shown in the there, and this point needs and please consider.
Embodiment
Below, the example of implementing the optimal morphology that the present invention uses with accompanying drawing, to concrete expression is put down in writing.
[example 1]
Use Fig. 1～Figure 11 that Hydrodynamic bearing type rotary device, recording medium control device and the correction oil injection method of example 1 are described.Hydrodynamic bearing type rotary device in the example 1 is the spindle motor that photomagneto disk is rotated.Recording medium control device in the example 1 is the disk apparatus that the spindle motor with example 1 is rotated photomagneto disk.Fig. 1 is the sectional view of schematic configuration of the revolving Hydrodynamic bearing type rotary device of axle of expression example 1.In Fig. 1, the 1st, axle, the 2nd, sleeve, the 4th, thrust plate, the 5th, cover plate, the 6th, pedestal, the 7th, motor stator, the 8th, rotor magnet, the 9th, photomagneto disk, the 10th, liner, the 11st, clip, the 12nd, rotor hub, the 13rd, oiling agent, the 14th, bubble, the 15th, oil accumulates portion.
Use Fig. 2 A, Fig. 2 B, Fig. 3 A and Fig. 3 B that the structure as the cover plate 5 of one of characteristics of the present invention is described.Fig. 2 A is the figure that sees an example of cover plate 5 from sleeve 2 sides (downside Fig. 1), and Fig. 2 B is its stereogram.Fig. 3 A is the figure of another example of expression cover plate 5, and Fig. 3 B is its stereogram.In Fig. 2 A, Fig. 2 B, Fig. 3 A and Fig. 3 B, the configuration example of expression axis hole 5A, air-vent 5B and recess 5C.Recess 5C among Fig. 3 A and Fig. 3 B, the recess 5C that is configured among its surface area ratio Fig. 2 A and Fig. 2 B is big.Recess 5C utilizes punch process to form or utilizes the cutting of end mill etc. to form.Shown in Fig. 2 A, Fig. 2 B, Fig. 3 A and Fig. 3 B, the coniform groove 2C of sleeve 2 is configured to ring-type (360 degree).
Refer again to Fig. 1.Rotor hub 12 is fixed on the axle 1, and rotor magnet 8, liner 10 and clip 11 are fixed on the rotor hub 12.On the other hand, pedestal 6 and thrust plate 4 are fixed on the sleeve 2, and motor stator 7 relatively is fixed on the pedestal 6 with rotor magnet 8.Disc 9 is to be used to the removably medium that write down and/or regenerate, in Fig. 1, is installed on the rotor hub 12 by liner 10, and is being fixed by clip 11.
Accompany oiling agent 13 in the gap between gap between axle 1 and sleeve 2 and axle 1 and the thrust plate 4.Oiling agent 13 is an oil.
Then, the above-mentioned Hydrodynamic bearing type rotary device that constitutes is illustrated its action.
At first, rotate magnetic field when to motor stator 7 energisings, rotor magnet 8 is subjected to rotating force, begins rotation with rotor hub 12, axle 1, disc 9, clip 11, liner 10.By rotation oiling agent 13 is accumulated among lambdoid dynamic pressure occurrence groove 1A～1D, between axle 1 and the sleeve 2, between flange 3 and the sleeve 2, and flange 3 and thrust plate 4 between generating pump suction pressure.Thus, axle 1 relative sleeve 2 ground float upward and rotate in the non-contact mode, utilize not shown record regenerating head, carry out the record regenerating of the data on the disc 9.
Then, use Fig. 4 and Fig. 5 that the effect of the Hydrodynamic bearing type rotary device of this example is described.At first, as shown in Figure 4, gap S1～S5 and distance D 1～D5 are defined.
The bearing radius clearance of dynamic pressure occurrence groove 1A portion is made as S1, radius clearance (width radially) between the inner peripheral surface of the outer circumferential face of axle 1 and cover plate 5 is made as S2, cover plate 5 and the gap between the sleeve 2 (axial width) on the inner peripheral surface of the coniform groove 2C of sleeve 2 (by the following cone shape space that constitutes of coniform groove 2C and cover plate 5 and the interconnecting part of bearing hole 1A) are made as S3, to be made as S4 at cover plate 5 and the gap between the sleeve 2 (the axial width) on the outer circumferential face (inner circumference edge of recess 5C) of the coniform groove 2C of sleeve 2, recess 5C and the gap between the sleeve 2 (the axial width) that is configured in the cover plate 5 on the periphery of coniform groove 2C of sleeve 2 will be made as S5.Each distance among the S1～S5 of these gaps is made as D1～D5 respectively, and sets for and make distance D 1～D5 satisfy the relation of following formula (1).
D1＜D2AD3＜D4＜D5 ……(1)
In this example, for example, set each clearance distance for D1=2 μ m, D2=20 μ m, D3=20 μ m, D4=100 μ m, D5=350 μ m.
Fig. 5 is illustrated in the plotted curve of the capillary force among above-mentioned gap S1～S5.Transverse axis is a distance, and the longitudinal axis is a capillary force.So-called capillary force is that oiling agent 13 utilizes its surface tension to want to invade power in the littler gap.In Fig. 5, when respectively the capillary force among the S1～S5 of gap being set as P1～P5, set up following formula (2).
P1＞P2P3＞P4＞P5 ……(2)
Near near the oiling agent 13 of (S5 of gap) oil accumulates portion 15, utilize capillary force concentrate on littler gap S2～S4 near, and constantly supply with to the direction of radial bearing portion with little gap S1 or dynamic pressure occurrence groove 1A.
Apply the occasion of impact load at convection cell bearing type whirligig, oiling agent 13 is expanded to peripheral direction in cone shape space in case guide to cone shape space from bearing hole 1A.Because cone shape space is more near periphery, axial width is big more, enlarges so accommodate the volume of oiling agent in the space, and oiling agent does not overflow from air-vent.When impact was calmed down, oiling agent utilized capillary force to be adsorbed to the narrow side of the section in cone shape space (direction of bearing hole), returns in the original bearing hole.Therefore, the oiling agent of a part remains in the cone shape space, does not worry that the oiling agent of bearing hole can little by little reduce.
Utilization is arranged near the recess 5C the outer circumference end of coniform groove 2C, and the oiling agent 13 that can will want to overflow is housed in the inside of recess 5C.Oiling agent 13 can be by air-vent 5B to external leaks.When oiling, utilize the big space of recess 5C, can easily draw the unnecessary oil of the inside that remains in cone shape space.Thus, can improve the operation of drawing unnecessary oil.
Again, sneak into the air 14 in oiling agent 13, in the many occasions of its amount, temperature around rises and occasion that its internal pressure rises or expand under environment under low pressure and occasion that its volume increases etc., in circulation port 2B, the below from Fig. 4 is moved upward.At this moment, also move at circulation port 2B in-lubricant with air 14.After oiling agent 13 and air 14 moved to oil and accumulate portion 15, oiling agent 13 utilized capillary force to concentrate near gap S2, the S3, and bubble 14 concentrates near the S4 of gap and near the S5.In addition because the distance D 5 of the distance D 4 ratio gap S5 of gap S4 is little, so bubble 14 accumulates portion 15 along oil outer periphery from circulation port 2B side direction recess 5C side around circumferentially mobile, only bubble 14 discharges from air-vent 5B.The air of sneaking in the oiling agent can successfully be emitted to the outside from air-vent.Thus, oiling agent can not be extruded outside bearing or leak, and only bubble 14 is successfully discharged to the bearing outside.
Then, use the flow chart of Figure 11, represent the correction oil injection method of oiling agent of the Hydrodynamic bearing type rotary device of this example.The sectional drawing of Fig. 6～Figure 10 is summarily represented the state of Hydrodynamic bearing type rotary device.
In the bearing portion after assembling is finished (state of Fig. 6), Sealing 16 is attached to carries out temporary sealing (state of S1101 Fig. 7) on the air-vent 5B.Sealing 16 is examples of temporary sealing device.
Then, the oiling agent 13 of established amount is carried out oiling and is coated on (S1102) near the gap of axle 1 and cover plate 5 from pump nozzle 17.So-called established amount is meant more than the amount of volume of the circulation port 2B that adds upper bush 2 in the volume of the clearance portion that is made of axle 1, sleeve 2, thrust plate 4, cover plate 5 (for example 2 times of degree).
Then, make bearing portion enter low pressure chamber, be decompressed to below about 0.1 barometric pressure (S1103) from barometric pressure.At this moment, the air of bearing inside increases because of decompression makes volume, discharges to the outside from the axle 1 and the gap of cover plate 5.
Then, boost to barometric pressure again, because the volume of the air of bearing inside reduces, the oiling agent 13 that is coated with in S1102 is inhaled in bearing inside (state of S1104 Fig. 8) from the gap between axle 1 and the cover plate 5.Because with air-vent 5B temporary sealing, so air can not enter from air-vent.At this constantly, oiling agent 13 is filled among bearing inside and the circulation port 2B.
Then, remove the Sealing 16 (S1105) of air-vent 5B.
Then, diameter is enough little fuel sucking pipe 18 is inserted into (state of S1106 Fig. 9) among the recess 5B by air-vent 5B.For fuel sucking pipe 18, for example can use the pipe of the polyacetal resin system of external diameter 0.16mm, internal diameter 0.10mm.Fuel sucking pipe is an example of Oil sucking device.
Then, the oiling agent from 18 couples of recess 5C of fuel sucking pipe carries out oil suction (state of S1107 Figure 10).In S1107, in the S1～S4 of gap, utilize strong capillary force that oiling agent 13 is kept, and gap S5, a little less than capillary force among the enough big recess 5C and the capillary force among the S1～S4 of gap are in a ratio of.Therefore, in recess 5C, utilize 18 pairs of oiling agents of fuel sucking pipe 13 to carry out oil suction easily.After the oiling agent 13 of recess 5C was drawn, air 14 flowed into from air-vent 5B, drew this air 14 from fuel sucking pipe 18.That is, oiling agent 13 is maintained among the little gap S1～S4 in gap, and can not surpass from fuel sucking pipe 18 needs the ground sucking-off.
Handle by carrying out a series of oiling shown in above-mentioned S1101～S1107, need in oil suction, not adjust, only fuel sucking pipe 18 is inserted in and carries out sucking-off among the recess 5C and just can finish the high oiling of precision oil sucting force and oil suction time.
Here, to using Sealing to be described, but be not limited to Sealing as the temporary sealing device, for example also can with have can air-vent is airtight shape or the anchor clamps of material, pushing ground seals near suction port.To using fuel sucking pipe to be described, but as described later, also can use other Oil sucking device as Oil sucking device again.
As mentioned above, adopt this example, the air of sneaking in FDB portion is discharged easily, can prevent that thus oiling agent from leaking.Again, can be correctly and easily the oil filling amount of the oiling agent of bearing unit is controlled, again, can not flow out even apply the impact load oiling agent yet, can realize the Hydrodynamic bearing type rotary device that reliability is high.
Again, at the diameter of axle 1 is that the diameter of 1～20mm, circulation port 2B is that the height (deduct S4 from S5 after numerical value) of 0.1～1.0mm, recess 5C is that the diameter of 0.05～1.0mm, air-vent 5B is the occasion of 0.10～1.0mm, and be in distance D 1 that 1～10 μ m, distance D 2 and D3 are that 20～100 μ m, distance D 4 are below the 1 80 μ m, distance D 5 has been for having carried out the occasion of setting to the distance in each gap in each scope more than the 0.1mm, can confirm as that oiling agent 13 can not flow out and air 14 can be discharged well.Again, especially in the occasion that distance D 2 and distance D 3 is set at 20 μ m degree respectively, even (be 1～10 millisecond action time) also can prevent the outflow of oiling agent 13 when bearing being applied the impact load of 2000G.
Again, fuel sucking pipe 18 is not limited to tube shape, even use belt shape, spongy or fibrous oil absorption material also can replace it, for example, confirms to utilize the sponge of diameter 0.16mm in experiment.
Again, in Figure 11, step S1103 handles after step S1102, even but handled before S1102 also and can play same effect.
[example 2]
Use Figure 12 that the Hydrodynamic bearing type rotary device in the example 2 is described.Hydrodynamic bearing type rotary device in the example 2 is the spindle motor that photomagneto disk is rotated.Recording device in the example 2 is the disk apparatus that the spindle motor with example 2 is rotated photomagneto disk.Figure 12 is the sectional view of schematic configuration of the Hydrodynamic bearing type rotary device of expression the invention process form 2.In Figure 12, point, the sleeve 2 of replace the point of axle 1 having axle 130, removing flange accommodation section 2D from sleeve 2 has the point of the new 2E of straight trough portion, and be different with example 1.The point of all the other is identical, omits its detailed explanation for the key element that indicates same-sign.
By making above-mentioned structure, coniform groove 2C is communicated with the bottom of bearing hole 2A, can prevent from dynamic pressure occurrence groove 1A, 1B and 1D, to produce oil film breakage.The 2E of straight trough portion utilizes the cutting by end mill etc. to form.
The Hydrodynamic bearing type rotary device of example 2 has the effect same with example 1.The correction oil injection method of the Hydrodynamic bearing type rotary device shown in the example 1, for axle 130 such width of this example greatly, do not have the bearing of flange 3 can similarly be suitable for yet, have the same effect.
[example 3]
Use Figure 13, Figure 14 A and Figure 14 B that the Hydrodynamic bearing type rotary device of example 3 is described.Hydrodynamic bearing type rotary device in the example 3 is the spindle motor that photomagneto disk is rotated.Recording medium control device in the example 3 is the disk apparatus that the spindle motor with example 3 is rotated photomagneto disk.Figure 13 is the sectional view of schematic configuration of the Hydrodynamic bearing type rotary device of this example of expression.Among Figure 13, have cover plate 5 ' and replace the point of cover plate 5 different with example 1.The point of all the other is identical, omits its detailed explanation for the key element that indicates same-sign.
Structure to the cover plate 5 ' of this example among Figure 14 A and Figure 14 B describes.Figure 14 A is the figure that sees an example of cover plate 5 ' from sleeve 2 sides (downside Figure 13).Figure 14 B is its stereogram.
Cover plate 5 ' has axis hole 5A, air-vent 5B ' and recess 5C.Axis hole 5A and recess 5C are identical with cover plate 5 in the example 1 shown in Fig. 2 A, Fig. 2 B, Fig. 3 A and Fig. 3 B.Air-vent 5B ' is set at the side of cover plate 5 '.
The Hydrodynamic bearing type rotary device of example 3 plays the effect identical with example 1.The correction oil injection method of the Hydrodynamic bearing type rotary device shown in the example 1, though as this example in the occasion of air-vent being located at the side of cover plate, also can similarly be suitable for, have the same effect.
[example 4]
Use Figure 15 that the Hydrodynamic bearing type rotary device in the example 4 is described.Hydrodynamic bearing type rotary device in the example 4 is the spindle motor that photomagneto disk is rotated.Recording medium control device in the example 4 is the disk apparatus that the spindle motor with example 4 is rotated photomagneto disk.Figure 15 is the sectional view of schematic configuration of the Hydrodynamic bearing type rotary device of this example of expression.In Figure 15, Hydrodynamic bearing type rotary device, different with the point that shaft fixed replacement axle is rotary with example 1.That is, fixedly to replace fixing with rotor hub 12 with pedestal 6, on the other hand, rotor hub 12 is fixed on the sleeve 2.The point of all the other is identical, omits its detailed explanation for the key element that indicates same-sign.
Rotate magnetic field when to motor stator 7 energisings, rotor magnet 8 is subjected to rotating force, begins rotation with rotor hub 12, sleeve 2, thrust plate 4, disc 9, clip 11, liner 10.By rotation oiling agent 13 is concentrated among lambdoid dynamic pressure occurrence groove 1A～1D, reaching generating pump suction pressure between flange 3 and the thrust plate 4 between axle 1 and the sleeve 2.Thus, sleeve 2 axle 1 ground relatively floats upward and rotates in the non-contact mode, utilizes not shown record regenerating head to carry out the record regenerating of the data on the disc 9.
Because the distance D 1～D5 to gap S1～S5 of defining in Fig. 4 has suitably done setting, so oiling agent 13 can be from leakage between axle 1 and the cover plate 5.Again, even applying the occasion of impact load, oiling agent 13 owing to utilizing strong capillary force to be concentrated near the S1～S4 of gap, can not flow out from air-vent 13.
As mentioned above, Hydrodynamic bearing type rotary device shown in the example 1 and correction oil injection method, can be applicable to too this example such, Hydrodynamic bearing type rotary device is shaft fixed situation, have the same effect.
[example 5]
Use Figure 16～Figure 18 that Hydrodynamic bearing type rotary device, recording medium control device and the correction oil injection method of example 5 are described.This Hydrodynamic bearing type rotary device is the spindle motor that photomagneto disk is rotated.Recording medium control device in the example 5 is the disk apparatus that the spindle motor with example 5 is rotated photomagneto disk.The Hydrodynamic bearing type rotary device of example 5 is identical with example 1.Figure 16 is the sectional view that the correction oil injection method of the Hydrodynamic bearing type rotary device injection lubricant oil of this example is described usefulness.Among Figure 16,, different with example 1 using pump nozzle 17A and 17B to carry out in the following correction oil injection method.The point of all the other is identical, omits its detailed explanation for the key element that indicates same-sign.
The correction oil injection method of the oiling agent of the Hydrodynamic bearing type rotary device of this example of flowcharting of use Figure 18.
In the bearing portion after assembling is finished, from pump nozzle 17A with oiling agent 13 oilings of the 1st established amount and be coated on (S1801) near the gap of axle 1 and cover plate 5.
Then, with the oiling agent 13 of the 2nd established amount from pump nozzle 17B oiling and be coated on the top of air-vent 5B, with air-vent 5B sealing (S1802).At this moment, the 1st established amount and the 2nd established amount sum become more than the amount of the volume that adds circulation port 2B in the volume of the clearance portion that is made of sleeve 2, thrust plate 4 and cover plate 5 (for example 2 times of degree).
Then, make bearing portion enter low pressure chamber, be decompressed to below about 0.1 barometric pressure (S1803) from barometric pressure.At this moment, the air of bearing inside increases because of decompression makes volume, and discharges to the outside from the axle 1 and the gap of cover plate 5.
Then, boost to barometric pressure again, because the volume of the air of bearing inside reduces, the oiling agent 13 that is coated with in S1801 and S1802 is inhaled in bearing inside (S1804) from gap between axle 1 and the cover plate 5 and air-vent 5B.At this constantly, oiling agent 13 is filled among bearing inside and the circulation port 2B.
Then, diameter is enough little fuel sucking pipe 18 is inserted into (S1805) among the recess 5B by air-vent 5B.
Carry out oil suction (S1806) from the oiling agent of 18 couples of recess 5C of fuel sucking pipe.In S1806, in the S1～S4 of gap, utilize strong capillary force that oiling agent 13 is kept, and among the S5 of gap, a little less than capillary force in enough big recess 5C and the capillary force among the S1～S4 of gap are in a ratio of.Therefore, in recess 5C, utilize 18 pairs of oiling agents of fuel sucking pipe 13 to carry out oil suction easily.After the oiling agent 13 of recess 5C was drawn, air 14 flowed into from air-vent 5B, drew this air 14 from fuel sucking pipe 18.That is, oiling agent 13 is maintained among the little gap S1～S4 in gap, and can not surpass from fuel sucking pipe 18 needs the ground sucking-off.
Handle by carrying out a series of oiling shown in above-mentioned S1801～S1806, need in oil suction, not adjust, only fuel sucking pipe 18 is inserted in and carries out sucking-off among the recess 5C and just can finish the high oiling of precision oil sucting force and oil suction time.
Adopt the correction oil injection method of this example, do not have step that attaches Sealing and the step of removing Sealing, can realize and to inject Hydrodynamic bearing type rotary device oiling agent, that reliability is high reliably with shorter time.
In addition, in step S1802, be coated with the oiling agent 13 of the 2nd established amount to the oiling of the top of air-vent 5B, with the oiling agent 13 oilings coating of the 2nd established amount, also can the 2nd recess 5D be set on the top of the air-vent 5B of cover plate 5 for reliably from pump nozzle 17B.That is, also can use the cover plate 5 (having the 2nd recess 5D) shown in the sectional view of Figure 17 B to replace the cover plate 5 shown in the sectional view of Figure 17 A.
Again, in Figure 18, step S1803 handles after step S1802, but is not limited thereto, and also plays same effect even handled before S1801.
In example of the present invention, Hydrodynamic bearing type rotary device is a spindle motor, and recording medium control device is the disk apparatus that photomagneto disk is rotated with spindle motor.But be not limited thereto, Hydrodynamic bearing type rotary device and recording medium control device also can be to install arbitrarily.For example, the recording medium that recording medium control device is controlled can be optical recording media, magneto-optic recording medium, magnetic recording medium etc.Recording medium both can be demountable medium such as DVD disc, also can be the medium that hard disk unit can not unload like that.Both can be the recording medium of disc shaped or also can be lacy recording medium.The capstan axle rotating driving device that Hydrodynamic bearing type rotary device for example is the spool rotating driving device of rotating driving device, the disk-like recording medium of disc, drive belt, the lift-launch on spiral sweep type record (or regeneration) device the device arbitrarily of rotating driving device etc. of magnetic drum of rotating magnetic head.Also Hydrodynamic bearing type rotary device of the present invention can be applied in the recording medium control device device arbitrarily in addition.
Hydrodynamic bearing type rotary device of the present invention for example can be used for the spindle motor of magneto-optical disc apparatus etc.Recording medium control device of the present invention for example can be used for magneto-optical disc apparatus, hard disk unit etc.In Hydrodynamic bearing type rotary device of the present invention, inject the correction oil injection method of oiling agent, for example can be as the correction oil injection method that injects oiling agent to spindle motor of the present invention.
With to a certain degree detailed content optimal morphology of the present invention is described, but in the thin portion of the present disclosure that constitutes this optimal morphology, can suitably change, do not depart from the scope of the present invention and the situation of thought under can realize the combination of each key element and the variation of order.
Claims (13)
1, a kind of Hydrodynamic bearing type rotary device is characterized in that,
Have in substantial middle and be provided with the sleeve of bearing hole and relatively rotate the axle that is inserted in freely in the described bearing hole with described sleeve, either party at least at the inner peripheral surface of the outer circumferential face of described axle and described sleeve, has the bearing surface that constitutes the dynamic pressure occurrence groove more than at least 1 group of pattern-like by a plurality of shallow slots, have in the gap between described axle and described sleeve and be full of the oiling agent bearing unit
In described bearing unit,
On the described sleeve or at described sleeve and roughly cover between the cover plate of end face of this sleeve and be provided with cone shape space, with the joint place of described bearing hole, axial narrow width, the closer to the periphery of described sleeve, axial width is wide more,
Peripheral part in described cone shape space is provided with the air-vent that air is come in and gone out from the outside.
2, Hydrodynamic bearing type rotary device as claimed in claim 1 is characterized in that,
One end of described axle is outstanding from described bearing hole,
Described bearing unit comprises the cover plate of at least a portion of the end face that has opening portion that outstanding described axle is passed through, covers described sleeve,
Between described sleeve and described cover plate, be provided with cone shape space, with the joint place of described bearing hole, axial narrow width, the closer to the periphery of described sleeve, axial width is wide more.
3, Hydrodynamic bearing type rotary device as claimed in claim 1 is characterized in that,
One end of described axle is outstanding from described bearing hole, and the other end has square with the axis thrust bearing surface,
This thrust bearing surface is relative with thrust plate on being fixed on described sleeve, has been full of oiling agent in the gap betwixt,
Described cone shape space near the end of the described bearing surface of the protuberance side of described axle, is being communicated with described bearing hole.
4, Hydrodynamic bearing type rotary device as claimed in claim 2 is characterized in that,
One end of described axle is outstanding from described bearing, and the other end has square with the axis thrust bearing surface,
This thrust bearing surface is relative with thrust plate on being fixed on described sleeve, has been full of oiling agent in the gap betwixt,
Described cone shape space near the end of the described bearing surface of the protuberance side of described axle, is being communicated with described bearing hole.
As each described Hydrodynamic bearing type rotary device in the claim 1～4, it is characterized in that 5, described cone shape space is configured to ring-type around described axle.
6, as each described Hydrodynamic bearing type rotary device in the claim 1～4, it is characterized in that, near the described cover plate the described scavenge port, be provided with the recess of the axial width broadening that makes described cone shape space.
7, as each described Hydrodynamic bearing type rotary device in the claim 1～4, it is characterized in that, to position, have also that an end is communicated with described bearing hole and intercommunicating pore that the other end is communicated with the peripheral part in described cone shape space at the position that is communicated with described bearing hole from described cone shape space near the other end of described axle.
8, as each described Hydrodynamic bearing type rotary device in the claim 1～4, it is characterized in that, the distance between the outer circumferential face of described axle and the inner peripheral surface of described cover plate be approximately equal to the joint of described bearing hole on the axial width in described cone shape space.
9, Hydrodynamic bearing type rotary device as claimed in claim 5 is characterized in that, described concave depth is more than the 0.05mm, below the 1.0mm.
10, Hydrodynamic bearing type rotary device as claimed in claim 1 is characterized in that, the diameter of described air-vent is more than the 0.10mm, below the 1.0mm.
11, a kind of recording medium control device is characterized in that, has each described Hydrodynamic bearing type rotary device in the claim 1～4, and the recording medium of belt shape or disc shaped is write down and/or regenerates.
12, a kind of correction oil injection method of described Hydrodynamic bearing type rotary device is the correction oil injection method that each described Hydrodynamic bearing type rotary device in the claim 1～4 is injected oiling agent, it is characterized in that having:
Utilize the temporary sealing device described air-vent to be carried out the step of temporary sealing;
Near the step of the injection oiling agent gap of described axle and described sleeve;
To the step that reduces pressure around the described Hydrodynamic bearing type rotary device;
Make the air pressure on every side of described Hydrodynamic bearing type rotary device be back to original step;
Remove the step of the described temporary sealing device of described air-vent;
Carry out the step of oil suction with the Oil sucking device insertion, near the oiling agent the described air-vent from described air-vent.
13, a kind of correction oil injection method of described Hydrodynamic bearing type rotary device is characterized in that, is the correction oil injection method that each described Hydrodynamic bearing type rotary device of claim 1～4 is injected oiling agent, it is characterized in that having:
Near near the step of the injection oiling agent gap of described axle and described sleeve and described air-vent;
To the step that reduces pressure around the described Hydrodynamic bearing type rotary device;
Make the air pressure on every side of described Hydrodynamic bearing type rotary device be back to original step;
Carry out the step of oil suction with the Oil sucking device insertion, near the oiling agent the described air-vent from described air-vent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004124367 | 2004-04-20 | ||
| JP2004124367A JP2005308057A (en) | 2004-04-20 | 2004-04-20 | Fluid bearing type rotating device, oiling method, and recording medium control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1690458A true CN1690458A (en) | 2005-11-02 |
| CN100357621C CN100357621C (en) | 2007-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100668413A Expired - Fee Related CN100357621C (en) | 2004-04-20 | 2005-04-20 | Liquid bearing type swiveling mechanism, creosoting process and recording medium control device |
Country Status (2)
| Country | Link |
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| JP (1) | JP2005308057A (en) |
| CN (1) | CN100357621C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384157A (en) * | 2010-08-25 | 2012-03-21 | 三星电机株式会社 | Hydrodynamic bearing assembly, motor provided with the hydrodynamic bearing assembly and recording disk driving device equipped with the motor |
| CN104179796A (en) * | 2014-09-04 | 2014-12-03 | 东方电气集团东方电机有限公司 | Oil supply method of liquid dynamic pressure thrust bearing |
| CN105090090A (en) * | 2014-05-12 | 2015-11-25 | 台达电子工业股份有限公司 | Fan and oil seal bearing thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008008313A (en) * | 2006-06-27 | 2008-01-17 | Matsushita Electric Ind Co Ltd | Method for manufacturing hydrodynamic fluid bearing, and electric motor and rotary device using the same |
| JP5154057B2 (en) * | 2006-10-27 | 2013-02-27 | Ｎｔｎ株式会社 | Hydrodynamic bearing device |
| JP2008291982A (en) | 2007-05-28 | 2008-12-04 | Panasonic Corp | Fluid bearing device, and spindle motor and recording and reproducing device equipped with the same |
| JP2008291983A (en) | 2007-05-28 | 2008-12-04 | Panasonic Corp | Fluid bearing device, and spindle motor and recording and reproducing device equipped with the same |
| JP6587851B2 (en) * | 2015-07-16 | 2019-10-09 | Ntn株式会社 | Wheel bearing device |
| DE102018222494A1 (en) * | 2018-12-20 | 2020-06-25 | Robert Bosch Gmbh | Method and device for dispensing sealant and housing for an electrical machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3206191B2 (en) * | 1993-03-15 | 2001-09-04 | 松下電器産業株式会社 | Spindle motor and method for assembling the same |
| DE69425119T2 (en) * | 1993-12-14 | 2001-02-15 | Hitachi, Ltd. | Recording disc device and rotating support structure therefor |
| JPH09236124A (en) * | 1996-02-29 | 1997-09-09 | Mitsubishi Heavy Ind Ltd | Thrust bearing device |
| JP2002354742A (en) * | 2001-05-22 | 2002-12-06 | Matsushita Electric Ind Co Ltd | Spindle motor |
| JP4248176B2 (en) * | 2001-12-14 | 2009-04-02 | 株式会社ジェイテクト | Hydrodynamic bearing |
-
2004
- 2004-04-20 JP JP2004124367A patent/JP2005308057A/en not_active Withdrawn
-
2005
- 2005-04-20 CN CNB2005100668413A patent/CN100357621C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384157A (en) * | 2010-08-25 | 2012-03-21 | 三星电机株式会社 | Hydrodynamic bearing assembly, motor provided with the hydrodynamic bearing assembly and recording disk driving device equipped with the motor |
| CN105090090A (en) * | 2014-05-12 | 2015-11-25 | 台达电子工业股份有限公司 | Fan and oil seal bearing thereof |
| CN105090090B (en) * | 2014-05-12 | 2020-11-17 | 台达电子工业股份有限公司 | Fan and oil seal bearing thereof |
| CN104179796A (en) * | 2014-09-04 | 2014-12-03 | 东方电气集团东方电机有限公司 | Oil supply method of liquid dynamic pressure thrust bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005308057A (en) | 2005-11-04 |
| CN100357621C (en) | 2007-12-26 |
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